scripts/spelling.txt: remove 'thead' as a typo

T-Head is a vendor of processor core IP, and they have recently introduced
the RISC-V TH1520 SoC.  Remove 'thead' as a typo of 'thread' to avoid
checkpatch incorrectly warning that 'thead' is typo in patches that add
support for T-Head designs in the kernel.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://www.t-head.cn/
Signed-off-by: Drew Fustini <[email protected]>
Acked-by: Guo Ren <[email protected]>
Cc: Conor Dooley <[email protected]>
Cc: Jisheng Zhang <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Diederik de Haas <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Luca Ceresoli <[email protected]> # versaclock5
Cc: Randy Dunlap <[email protected]>
Cc: SeongJae Park <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: pdp7

scripts/spelling.txt

@@ -1541,7 +1541,6 @@ temeprature||temperature
 temorary||temporary
 temproarily||temporarily
 temperture||temperature
-thead||thread
 theads||threads
 therfore||therefore
 thier||their